diff --git a/dom/media/PeerConnection.js b/dom/media/PeerConnection.js
index 700e371364..622b1f08be 100644
--- a/dom/media/PeerConnection.js
+++ b/dom/media/PeerConnection.js
@@ -976,11 +976,6 @@ RTCPeerConnection.prototype = {
     stream.getTracks().forEach(track => this.addTrack(track, stream));
   },
 
-  getStreamById: function(id) {
-    throw new this._win.DOMException("getStreamById not yet implemented",
-                                     "NotSupportedError");
-  },
-
   addTrack: function(track, stream) {
     if (stream.currentTime === undefined) {
       throw new this._win.DOMException("invalid stream.", "InvalidParameterError");
diff --git a/dom/webidl/RTCPeerConnection.webidl b/dom/webidl/RTCPeerConnection.webidl
index 7ec5cc797b..b852d32070 100644
--- a/dom/webidl/RTCPeerConnection.webidl
+++ b/dom/webidl/RTCPeerConnection.webidl
@@ -108,8 +108,6 @@ interface RTCPeerConnection : EventTarget  {
   sequence<MediaStream> getLocalStreams ();
   [UnsafeInPrerendering, Deprecated="RTCPeerConnectionGetStreams"]
   sequence<MediaStream> getRemoteStreams ();
-  [UnsafeInPrerendering]
-  MediaStream? getStreamById (DOMString streamId);
   void addStream (MediaStream stream);
 
   // replaces addStream; fails if already added